I have a question regarding financial accounting.

I have a question regarding financial accounting. When a company is trying to sell their inventories as quick as possible, they ask retail stores to accept their inventories without any payment upfront, only requiring to pay them back once the items are being sold. And the retail stores are able to return the remaining inventories anytime they want. Is it legal for the company to do so to aggressively increase their revenue. 

SURNAME1NameProfessorDateUnder IFRS 15 upfront fees are to be deferred and recognized over a period. That is,representing the average life of a customer relationship. Therefore, it is illegal...